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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7faf76d27df1bcd2c94a507dcce407ff762b58186b1162af08e9b4f7b8078739' 
  AND token = 'eEOypRTHwHQs8BnuTjU6isb/xE6uizD4OvrNFQjwEg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}